True or False: Swamp coolers, whole house fans, and window air conditioners lower radon concentrations.

The statement is true because swamp coolers, whole house fans, and window air conditioners can potentially lower radon concentrations. These systems create a pressure differential that can aid in reducing the entry of radon gas into the home. By using a swamp cooler or a whole house fan, for instance, you increase ventilation and can promote airflow, which can help dilute indoor radon levels. Similarly, window air conditioners can keep the indoor environment cooler while also influencing air movement.

However, it is important to note that the effectiveness of these systems in reducing radon can vary based on specific installation, design, and environmental conditions. While they may contribute to lowering radon levels, they should not be solely relied upon for radon mitigation. Active radon mitigation systems are designed specifically for that purpose and are often more effective.

The other options indicate different considerations regarding the types of systems or the conditions under which they might function, but the overall capacity of these cooling methods to lower radon concentrations under appropriate use allows the statement to be classified as true.